Air-belease valve



G. F. HITCHCOCK AIR RELEASE VALVE- April 7, 1931. Re. 18,029

Original Filed April 16, 1926 2 Sheets-Sheet 1 I 1 I l T gwuento'b I am y April 7; 1931. Re. 18,029

AIR RELEASE VALVE Qriginal Filed April 16, 1926 2 Sheets-Sheet 2 Reissued Apr. 7, 1931 UNITED ESTATES PATENT orrms r. museum, or Ho'ustron, "rExA' s; ASSIGLIOR'OI oirii 'i rrm'f A, i jro":iiai *;r.j roirniiison A m ONE-THIRD 'ro 'rnomns'n. 'MEEKs, or HARRIS cot'irrrraxss AIR-RELEASE 'oflgmai ep nomon-med April 16,1926, Serial 110.10%,873. Renews-au men- Original in. J fldomaraated November 13, 1928. nppli'eationfor reissuemes novemer ia-isso.- Serial mirmAee.

' This invention relates to new and useful in: rovernents in an air-release --valve.

e'object of'theinve'ntion is to providea novel type of release valve, adapted to be applied directly to anair pressure reservo r, or to the extension pipe, leading therefrom *forming part of the air brake system of railway trains, and whereby the air pressure may be easily relieved from said reservoir.

Another object is to provide an air release native of thety'pe disclosed which willbe'very easy to open' by reason of the fact that the air pressure in the tank does not resist the openmgof-the valve.

"A further object of the invention is to pro wide an air release valve of the character described which is of very simple construction,

and may be easily operated and'readlly ape ied.

a. ith the above and other objects in view,

this'inventionhas particular relation to certain novel features of construction, operation and-arrangement of parts, an example of "which is given in this specification and illustratedin the accompanying drawings, wherewith. I Beyond-the reduced end 3'the casingis v .preferably of polygonal shape, as at 4, to receive s, wrench for'screwing the valve into The outer rt of the valve'casing is formed into a 'cylin er5, having the lateral relief ports 6. An air relief conduit 7 leads through the casing 2 from the interiorof'the reservoir and'terminates in the cylinder 6.

: P"Driven into the outer end of the relief 'conoperating on the top' ofthe cap 13, as a fillmaining pressure. Thereilpon the spring 14 'duit 7 there is a tubular valves'eat 8 whose outer end is forinedwit'haknife edge and a valve 9' cooperatesiwith said seat to 'norr'n'ally close the "relief conduit.

This valve is carried by the under side bf he piston'lOwhichwor s in the cylinder-5.

Fastened to the piston '10 "there is'an outstanding stern 1'1, which' works through a bearing'12 in the'cap 13. This cap is bolted onto the casing 2 and encloses a coil springn which "surrounds the ste'm 11 and is int-erposed between the c'ap ahdpiston'and normallv holds the valvef-9in-clos'ed position, also holding the :piston 10 inrposition to'cl ose the ports'6.

There is a silbst'antially mmwybkefi having a central bearing 16 to receive'the 'oiiter end of the-stem 11 and fprovidedwitli across in 17, which works-loosely in a c ross' b'ear- 1n 18 in theo uter'endjoifTthe steni'11. he operating rods 19, 19, are connected at'their inner en'ds to'the respective en'dsjof "the yoke '15 'and theoii-teneiids offthe'rods are accessible under the 'rspecavegsidesi of the car beneath which'the reservoir lis'lo- :cated.

Normally the air pressure inthe reservoir will not be siifiic'ient to lift 'the'valve' 9 and piston 10,"on account of the-small area of the valve v9, againstwhich'the pressure-ma operate. In order to relieve the pressure in the reservoir 1 either rod 1 9 ma be'p'lilled outwardly which will operate to elevate the corresponding end of the .yoke '15, 'saidfyoke crum, and the piston 10 is thereby slightly lifted to admit air into the cylinder 5"and on account of thelarge area of the piston against which theair under pressi refiimy now operate, the piston-will be'li ftedi,by said pressure/to uncoverthe ports 6, andt'hepressure in the reservoir will be immediately reducedto such a point that the airbrake cylinder will automatically 'release'the rewill force the' piston 10 downwardly 'a'nd seat the valve'9 forcing the air in theeylinder out through the sinall relief port 20 in the bottom of the cylinder, This'relif port also prevents "the accumulation of the air in the cylinder, which might leak past the valve 9, and rematurely lift the piston 10, and release e air pressure from the reservoir 1.

What I claim is 1. A valve includin a valve casing, formed with a cylinder aving a relief conduit entering the cylinder and a relief port leading therefrom, a piston in the cylinder normally closing said port, a valve carried by the piston normally closing said conduit, means normally holding said piston and valve in closed position and a manually operable yoke pivotally connected to the outer end of the piston whereby the same may be lifted to open said conduit and port.

2. A valve including a valve casing formed with a cylinder having an air inlet conduit and a relief port, a piston in the'cylinder arranged to normally block said conduit and port, a yieldablemember'operating against the piston and normally holding the same seated and a yoke upon the outer end of the piston for lifting the piston to open said conduit and ort.

3. A va e including a valve casing formed with a cylinder and having a pressure relief conduit entering the cylinder and a pressure relief port leading from said cylinder, a hearing member fastened on said casing having a bearing, a piston. in the cylinder adapted to close said port, a valve carried by the piston adapted to close said conduit, a stemv connectedto the piston and working through said bearing, a yieldable member interposed between said bearing member and piston, a yoke above the bearing member and having a pivotal connection with said stem and op eratin rods connected to the respective ends of sai yoke. j

4. A valve including a valve casing formed with a cylinder having an air relief conduit entering the cylinder and a plurality of air relief ports leading from the cylinder, a piston in'said' cylinder normally blocking said relief ports, said piston being formed with a valve which normally closes said relief conduit, a cap on said body formed with a hearing, a stem carried by the piston working through said bearing, a yieldable member operatin against the piston and normally holding 51% same in position to close said relief ports and said relief conduit, and a yoke pivoted to the stem through which the piston may be lifted to open said conduit and ports.

5. A valve including a valve casing formed with a cylinder and having an air inlet conduit, a valve seat in the end of said conduit which terminates in the cylinder, said cylinder also having relief'ports, a piston in said cylinder normally blocking said relief ports, a valve carried by the piston adapted to cooperate with said seat, a cap secured to said body and formed with a bearing, a stem carried by the piston and working throughsaid bearing, a yieldable member interposed between said cap and piston, a yoke having a ivotal connection with the outer end of sa1d stem and o crating rods hinged to the respective ends 0 the yo 6. A valve mechanism including a casing formed with a cylinder and having a pressure relief conduit and an air relief port,'a piston in the cylinder normally bl said port and formed with a valve whi normally blocks said conduit, a bearing member secured to said casin and ha a bearing, a stem carried by t e piston an working through said bearing, a oke pivotally connected to the outer end of said stem, an operatin rod pivotally connected to each end of t e yoke, and a 'yieldable member acting a ainst the piston and normally holding t e same in position to block 1 said port.

7. A valve mechanism including a casing formed with a cylinder and havin a pressure relief conduit and an air re ef ort, a piston in the cylinder normally bloc 'n said port and formed with a' valve whicE normally blocks said conduit, a cap secured to said body and having a bearing, a stem carried by the piston and working through said bearing, a yoke pivotally connected to the outer end of said stem, connected to each end of yieldable member acting against the piston normally holding the same in position to block said port.

8. A valve mechanism including a casing formed with a cylinder having a pressure relief conduit enterin the cylinder and air relief ports leading cm the c linder, a piston in' the cylinder normally b ocking one of said ports and having a valve which normally blocks said conduit, means for manually moving said piston into one position to open the port normally blocked by it, and to simultaneously open said conduit and yieldable means through which the piston may be moved in the other di rection to close the port controlledby the piston, the other port being at all times open.

9. An air release valve including a valve casing, a cylinder associated therewith having a relief conduit entering the same and a relief port leading therefrom, a movable member in the cylinder interposed-between the conduit and port and shaped to close both conduit and port, when in one position,v

a yieldable-element action to normally hold said member in said closed position, means on said member through which said member may be actuated into another position to open said conduit and port, and a manuall operable device arranged to act on sai means to move said member into said open position. v f

10. An air release valve including a'casing and an associated cylinder, said cylinder having a relief conduit and an air relief 0 rating means th yoke and a port, a piston in the cylinder arranged to normally block said conduit and port, a yieldable member arranged to hold the piston in position to normally block said conduit and port, and a manually operable device arranged to lift the piston to operate said conduit and port.

11. A valve includin a valve casing formed with a cylinder aving an air inlet conduit and a relief port, a piston in the cylinder arranged to normally block said conduit and port, a yieldable member operating against the piston and normally holding the same seated and a yoke, at the outer end of the piston, for lifting the piston to open said conduit and port.

12. An air release valve including a valve casing, a cylinder associated with the easing and having an air relief conduit and a 20, relief ort, a seat in said device, a piston in the cy inder arranged to seat against said seat and to normally block said conduit and port, a yieldable member effective to normally hold the piston seated to close said conduit 26 and port, manually operable means for moving the piston into position to open said conduit and port, said piston being so shaped that a greater area thereof will be exposed to the pressure of the fluid flowing through so said conduit when opened than when closed.

13. An air release valve including a casing and an associated cylinder, said cylinder having a relief conduit and an air relief 7 port, a piston in the cylinder arranged to normally block said conduit and port, a

yieldable member arranged to hold the piston in position to normally block said con duit and port, and a manually operable device arranged to lift the piston to open said conduit and port, said piston being arranged so the pressure to be released will assist in lifting said piston, and will temporarily hold the piston in open position.

In testimony whereof witness in signature, this 8th day of November, A. 1930.

GUY F. HITCHCOCK. 

